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  1. #11
    CBG
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    Quote Originally Posted by TheFlyingCamera View Post
    7x9 or 6x8.5.
    Maybe the image sizes are a closer match, but the nominal sizes of 7x9 and 6x8.5 don't match the aspect ratio of 4x5.

    C

  2. #12
    TheFlyingCamera's Avatar
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    Well, it's 7.2 x 9 to be precise. And there's also 5x6.25, 6x7.5, and 7x8.75 . None of which are anything resembling a standard mat size.

  3. #13

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    Take the long dimension, any length, and multiply by .8, or divide by 4.
    Frank Schifano

  4. #14
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    Quote Originally Posted by Ole View Post
    But 5x7" paper fits nicely in a 13x18cm holder, since the 13x18cm film is really 12.7x17.7cm, and nominal 5x7" is 12.7x17.8cm...
    I think the 12.5x17.5 cm film is nominally 5x7". The other way doesn't explain why the nominal 5x7 film holder is too small for 5x7" paper. But most of us will never try it, so why quibble?
    Gadget Gainer

  5. #15
    Ole
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    Eh yes - my explanation might well be confusing:

    '5x7" film' is smaller than 5" x 7", at about 125x175mm. By 'nominal 5x7"' I meant 5" by 7", which would be 127x178mm - which coincidentally is very close to the standard size of 13x18cm film. And 5x7" paper really is 5" by 7", or the size of a 13x18cm film.

    It's all back to those pesky cut sheet film adapters for glass plate holders. The glass plates were "full size", so that defined the outer dimensions of the film adapters. To fit inside the film needed to ba a few mm smaller than the outside of the sheath.
    -- Ole Tjugen, Luddite Elitist
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  6. #16
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    Yes, I have one of those plate holders, for which I made a cut film adapter of aluminum sheet.
    Gadget Gainer

  7. #17

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    Quote Originally Posted by TheFlyingCamera View Post
    Well, it's 7.2 x 9 to be precise. And there's also 5x6.25,
    6x7.5, and 7x8.75 . None of which are anything
    resembling a standard mat size.
    Here's a good one, 5.5 x 6 7/8, an exact 4x5 ratio. Make
    that x7 and you've 4 from 11x14. Subtract a 1/4 inch all
    around for a very good 6x4.5 full frame match.

    I've likely a few more full frame 6x4.5 needing printing
    so will need a custom easel. Happens to very nearly
    half way twixt a 4x5 and 8x10 in sq. inches. Dan

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